Format, validate, and beautify JSON data with error detection
Detects JSON compliance and pinpoints exact syntax errors with clear warnings.
Your JSON data is parsed locally. Your API tokens, configs, and keys never leave your machine.
Instantly formats and pretty-prints raw JSON strings with standard tab indentations.
Everything runs inside your web browser. We never upload your text, files, or personal data to any servers.
No sign-ups, no subscriptions, and no usage limits. Get your results instantly in a single click.
Yes, it parses your JSON and warns you about missing brackets, quotes, trailing commas, or syntax errors, showing you exactly where they occur.
Yes. Since the processing runs locally on your computer, it handles large files (up to several megabytes) smoothly, depending on your system memory.
No. We process all JSON calculations strictly on the client side. Your data remains completely private and is never uploaded.
The formatter uses a standard 2-space indentation style, which is the web industry standard for readable JSON configuration files.
Our tool supports standard JSON syntax. Comments are not officially allowed in standard JSON, so the validator will flag comments as syntax errors.
Yes, completely. All calculations and file conversions happen entirely inside your own browser. We do not store, view, or upload any of your input data to our servers.
No. UtilsGo is 100% free. You don't need to create an account, register, or pay for any features.
"Beautify and validate JSON in seconds. Saved my debugging workflow."
Thomas Anderson
✓ VerifiedThousands of users trust UtilsGo daily
Built by UtilsGo • Last updated May 2026 • No ads • No tracking